/usr/bin/sparc64-linux-gnu-gnathtml is in gnat-7-sparc64-linux-gnu 7.3.0-16ubuntu3cross1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/bin/sparc64-linux-gnu-gnathtml-7
/usr/bin/sparc64-linux-gnu-gnathtml-7